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Findings of diagnostic techniques.
| Heteroskedasticity | Serial correlation | Ramsey test | ||||
| Model A | F-statistic | 0.308853 | F-statistic | 0.454049 | F-statistic | 0.37281 |
| Model B | F-statistic | 0.091074 | F-statistic | 0.023862 | F-statistic | 0.025706 |
| Model C | F-statistic | 0.362872 | F-statistic | 1.266271 | F-statistic | 2.254878 |
| Model D | F-statistic | 1.097822 | F-statistic | 0.241042 | F-statistic | 0.56118 |
| Model E | F-statistic | 0.642662 | F-statistic | 0.433606 | F-statistic | 0.257286 |
Author’s calculation.
